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clarify required parallelism for scalapack

Meisam Tabriz requested to merge mpi_para into develop

Currently, while running the Octopus with OpenMP-only parallelization it reports:

************************** Parallelization ***************************
Info: Octopus will run in *parallel*

      Number of processes           :       1
      Number of threads per process :      18

**********************************************************************

But if the scalapack is needed, the error reads:

**************************** FATAL ERROR *****************************
*** Fatal Error (description follows)
*--------------------------------------------------------------------
* The scalapack subspace diagonalization can only be used in parallel.
*--------------------------------------------------------------------
Edited by Meisam Tabriz

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